JPH06105504B2 - Optical information recording / reproducing device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an optical information recording / reproducing apparatus including a carriage.

2. Description of the Related Art Generally, an optical information recording / reproducing apparatus is equipped with a carriage for holding and carrying a pickup for converting light energy into electric energy. May collide with stoppers installed on both sides of the road. And in that case, the deviation of the optical system components held by the pickup,
Distortion of the carriage or spot aberrations on the overall disc surface may occur, making it impossible to write information to the disc. Also, in the auto loading mechanism,
There is a risk that the pickup may collide with a groove formed in the jacket for transporting and positioning the jacket, resulting in damage to the jacket and the pickup.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and reduces the impact applied to a carriage or the like at the time of a collision of a carriage with a stopper, shifts of optical system components, distortion of the carriage, and spots on the overall disk surface. An object of the present invention is to provide an optical information recording / reproducing apparatus capable of preventing the occurrence of aberrations and preventing damage to a jacket and a pickup in an auto loading mechanism.

SUMMARY OF THE INVENTION In the optical information recording / reproducing apparatus of the present invention, stoppers which are provided at both ends of a track of a carriage and prevent runaway of the carriage are movable in the radial direction of the disk outside the track, and further between the stoppers. The urging means for urging the stopper toward the inside of the track when the stopper is moved to the outside of the track is connected.

Embodiments of the Invention Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 shows a first embodiment of an optical information recording / reproducing apparatus according to the present invention, in which reference numeral 1 represents a base.
This base 1 has a cross section (transverse cross section) orthogonal to its longitudinal direction.
Are formed so as to have a character shape as shown in FIG. And a box 1a provided at one end of the base 1
A motor 2 is installed therein, and a drive shaft (not shown) of the motor 2 is provided with a turntable 3 that supports a disk (not shown). Further, cylindrical rails 4 are attached to the inner surface of the base 1 as shown in FIGS. 2 and 3.
This rail 4 extends in the axial direction of the base 1,
It is fixed to the base 1 by a bolt 5 and an L-shaped rail retainer 6.

On the other hand, the carriage 8 carrying the pickup 7 is
As shown in the drawing, it is formed in a rectangular tube shape so as to have a hollow portion 8a extending in the axial direction of the base 1. Three pairs of bearings 9 that engage with the rails 4 are attached to the lower portion of the carriage 8. The rolling of the bearings 9 allows the carriage 8 to move in the radial direction of the disk along the rails 4. Has been done. One of the three pairs of bearings 9 is attached to the carriage 8 via a leaf spring 9a as shown in FIG. 4, and the pair of rollers 9 are pressed against the rail 4 by the leaf spring 9a. There is. In addition, on the upper surface of the lower wall that defines the hollow portion 8a of the carriage 8, a bobbin 11 in the shape of a rectangular tube having a coil 10 mounted on the outer periphery thereof.
Are attached via bolts 12. In FIG. 2, reference numeral 8b represents counter balance.

On the other hand, on the base 1, at a position corresponding to the bobbin 11,
A prismatic yoke formed to be loosely fitted to the bobbin 11.
13 is provided so as to extend in the axial direction of the base 1. Further, as shown in FIG. 3, support members 14 for supporting the yoke are provided on both sides of the yoke 13, respectively. A recess 14a is formed in the support member 14 at a portion facing the yoke 13, and plate-shaped permanent magnets 15 are fixed to the recess 14a. Thus, the yoke 13
A bobbin 11 screwed to the carriage 8 is engaged with the carriage so as to be loosely fitted. At that time, a certain gap is formed between the bobbin 11 and the permanent magnet 15. .

A shock absorber 16 is provided below the yoke 13 as shown in FIGS. 1 and 4. That is, base 1
A lower guide plate 17 made of a resin material such as polyacetal resin or Teflon that is easy to slide is screwed onto the upper surface of the lower wall.
Further, above the lower guide plate 17, a surrounding plate 18 that regulates the track of the carriage 8 is provided. This enclosure board 18
The lower surface of the upper guide plate 19 of the same material as the lower guide plate 17
Is screwed on. And the surrounding plate 18 is the lower guide plate 17
It is attached to the lower wall of the base 1 so that a constant horizontal gap is formed between the upper guide plate 19 and the upper guide plate 19. A part of the sliding plate 20 is inserted from both edges of the surrounding plate 18 into the horizontal gap formed by the lower guide plate 17 and the upper guide plate 19. This sliding plate 20 is bent to have a horizontal portion and a vertical portion, and a spring 20a is stretched over the inner end of the track in the horizontal portions of both sliding plates 20. The sliding plate 20 is biased inward of the carriage 8 track.

Further, a stopper 21 made of an elastic material such as rubber is attached to the vertical portion of the sliding plate 20 at a portion facing the inside of the track of the carriage 8. By the way, this stopper 21
The mounting height is preferably near the center of gravity of the carriage 8. This is to prevent the carriage 8 from being twisted or the like due to a moment resulting from the deviation between the line of action of force and the center of gravity.

Further, the optical information recording / reproducing apparatus of this embodiment is provided with an optical encoder device 22 as shown in FIG. 2 for detecting the pickup position. That is, the scale 25 is attached to the attachment portion 23 provided on one side of the carriage 8 via the scale retainer 24. On the other hand, base 1
A light emitting element 26 and a lens 27 are incorporated in a portion corresponding to the scale 25 from outside the base 1 toward the scale 25. A slit 28 and a detector 29 are attached to the inner surface of the base 1 so as to be located between the scale 25 and the outer surface of the carriage 8.

Next, the operation of the optical information recording / reproducing apparatus of this embodiment will be described. The carriage 8 is moved in the radial direction of the disk along the yoke 13 by passing a current through the coil 10.

Further, when the carriage 8 runs out of control due to some disturbance, the optical information recording / reproducing apparatus of this embodiment operates as follows.

For example, in FIG. 1, when the carriage 8 runs out of control and collides with the right stopper 21, the force causes the right sliding plate 20 supporting the stopper 21 to move slightly to the right against the spring 20a. To do. At that time, the impact of the carriage 8 is absorbed by the spring 20a. Further, in FIG. 1, the same applies when the carriage 8 runs away and collides with the left stopper 21.

According to the optical information recording / reproducing apparatus of the present embodiment having such a configuration / operation, the impact force applied to the carriage 8 or the like when the carriage 8 collides with the stopper 20 can be relaxed within a certain finite distance. It is possible to effectively prevent the displacement of system components, the distortion of the carriage 8 and the generation of spot aberrations on the overall disk surface, and it is possible to prevent the jacket and the pickup from being damaged in the auto loading mechanism.

6 and 7 show a second embodiment of the optical information recording / reproducing apparatus according to the present invention. This second
Unlike the first embodiment, in this embodiment, two bobbins 11 to which the coil 10 is attached are provided on the upper surface of the upper wall of the carriage 8. That is, as shown in FIG. 7 and FIG. 8, two dovetail grooves 30 are formed on the upper wall of the carriage 8 so as to sandwich the pickup 7 therebetween. Further, a dovetail 31 corresponding to the dovetail groove 30 is formed on the lower side of the bobbin 11 as shown in FIGS. 9 (a) and 9 (b). Then, the bobbin 11 is, as shown in FIG.
It is attached to the carriage 8 by fitting the dovetail groove 30 with the dovetail groove 31.

On the other hand, the base 1 is provided with a yoke 13 at a position corresponding to the two bobbins 11. Also, on the inner surface of the character wall of the base 1, a permanent magnet is provided at a position corresponding to the bobbin 11.
15 are provided.

Further, in the optical information recording / reproducing apparatus of the present embodiment, unlike the first embodiment, the light emitting diode 26, the lens 27, the slit 28 and the detector 29 are provided in the carriage 8.
Built in. On the other hand, a scale 25 is attached to the base 1 so as to extend in the axial direction of the base 1 through the space 8C formed in the carriage 8.

The rest of the configuration is almost the same as that of the first embodiment, and the same components are assigned the same reference numerals and explanations thereof are omitted. Incidentally, with respect to the position of the center of gravity of the carriage 8 of this embodiment, the center of gravity of the carriage 8 exists near the scale.

The optical information recording / reproducing apparatus of the present embodiment configured as described above can also achieve the same actions and effects as those of the first embodiment.

In the above first and second embodiments, the spring 20a is given as an example of the urging means of the shock absorber 16, but together with the spring 20a, the oil as shown in FIG. A dashpot 34 that includes a cylinder 32 that encloses the cylinder 32 and a piston 33 that can reciprocate in the cylinder 32.
May be used, and these numbers are not limited to the illustrated embodiment. The fluid sealed in the cylinder 32 of the dashpot 34 may be air, and a sliding ring for smoothing sliding may be provided at the sliding portion between the piston 33 and the end of the cylinder 32.

As described above, according to the present invention, the carriage on which the pickup is mounted and which can reciprocate in the track extending in the radial direction of the disk, and the runaway of the carriage which is provided on both edges of the track, are provided. In the optical information recording / reproducing apparatus having a stopper for blocking, the stopper is movable in the radial direction of the disc outside the track, and the stopper further moves the stopper to the outside of the track. In this case, since a shock absorber including an urging means for urging the stopper toward the inside of the track is connected, the impact force applied to the carriage or the like when the carriage collides with the stopper is mitigated within a finite distance. Therefore, it is possible to effectively prevent the displacement of the optical system parts, the distortion of the carriage, and the generation of the spot aberration on the total disc surface, and the automatic loading mechanism is In this case, damage to the jacket and the pickup can be prevented.

[Brief description of drawings]

1 is a front sectional view of a first embodiment of an optical information recording / reproducing apparatus according to the present invention, FIG. 2 is a left side sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a plan view of the optical information recording / reproducing apparatus shown in FIG. 4, FIG. 4 is a plan view in which a part of the shock absorber is omitted, and FIG. FIG. 6 shows the second of the present invention.
FIG. 7 is a plan view of the optical information recording / reproducing apparatus according to the embodiment of the present invention, FIG. 7 is a left side sectional view showing a part of the optical information recording / reproducing apparatus shown in FIG. 6, and FIG. 9A and 9B are schematic plan views of the bobbin of the optical information recording / reproducing apparatus shown in FIG.
9A is a left side view of the bobbin, FIG. 9B is a front view in which a part of the bobbin is cut away, and FIG. 10 is a vertical cross-sectional view of the dashpot. 1 ... Base 3 ... Turntable 4 ... Rail 7 ... Pickup 8 ... Carriage 9 ... Bearing 10 ... Coil 11 ... Bobbin 13 ... Yoke 16 ... Shock absorber 20a ... Spring 21 ... Stopper 34 ... Dashpot

Claims (1)

[Claims] 1. An optical system comprising a carriage that is reciprocally movable in a track extending in a radial direction of a disk on which a pickup is mounted, and stoppers provided at both ends of the track to prevent the carriage. In the information recording / reproducing apparatus, the stopper is movable in the radial direction of the disc outside the track, and between the stoppers, when the stopper is moved outside the track, the stopper is inside the track. An optical information recording / reproducing apparatus, characterized in that a biasing means for biasing toward one side is connected.